Leave accrual on Base Salary staff

Hello, I am a bit of a newbie at MYOB and payroll and have found that the leave information has not be accruing.

We are salaried staff and the wages info is the following:

On the wages tab:

Pay basis - Salary

and the wage category is - Base Salary

The LSL, AL, PL wage categories are all chosen based on the type of wage as 'hourly'

When I go to the entitlements tab:

AL, PL, LSL Calculation basis are all Equals X percentage of Gross hours

NOW, I think I have worked out that the entitlements categories the 3rd option needs to be selected which is Equals X hours per [month] - we get paid monthly.

Question:

Does the Leave categories (under the wages tab) currently as Hourly need to be made Salary? And if yes, it says if I change it will change all employes leave info.

On the Entitlements Tab:

How do I work out what are the X for Equals 'X' hours per [month].

One staff member works 2 x 8 hour days per week  69.33 hours per month

One staff member works 3 x 8 hour days per week  104 hours per month 

This has taken me hours to try to work out what the problem is.

Thanks

Bernie